It was the artist Marc Quinn who decided to make the statue after the woman's photo was in the news. He did it himself, as a temporary statement, and apparently hoped it would keep the statue discussion in the public eye. He made it at his own expense and will pay the council's removal costs.
He will now sell the statue and give the money to local charities.
I think it will raise quite a lot.
He's a well known artist (remember Alison Lapper Pregnant?) and it captures a moment in time.
I don't really understand why you are so cross about it. Ok, it was "against planning" - but no harm is done and maybe some good will come of it.
Personally I think they should have taken a bit longer to remove it.